Rear differential chatter

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Dec 2, 2024 | 06:50 PM

Kintla

Thread Starter

Tuned

Joined: May 2021

Posts: 363

Likes: 121

From: Montana

Rear differential chatter

I just picked up a 2017 Expedition at GSA auction. First thing I noticed is a grabbing/grinding from rear end when turning from a complete stop.

I changed out the rear diff fluid with 75w 85 and put in 4oz of friction modifier, which fixed about 90% of the problem, but I'm still getting some grabbing/noise from the rear end.

Any suggestions? I'm wondering if the clutches are bad or if I should try more friction modifier?

Jan 27, 2025 | 09:31 AM

rattosh51

Mountain Pass

Joined: Apr 2007

Posts: 237

Likes: 2

From: St. Paul, MN

Ever figure anything out on this?

Jan 27, 2025 | 12:04 PM

meborder

Moderator

Joined: Jul 2011

Posts: 6,509

Likes: 662

From: Sioux Falls Area

My 2020 was doing this. The chattering when warm was really bad.

I took it into the dealership and left with a new differential. The description of the internal damage was impressive.